var a = require('debug')('worker:a')
    , b = require('debug')('worker:b');

function work() {
    a('doing lots of uninteresting work');
    setTimeout(work, Math.random() * 1000);
}

work();

function workb() {
    b('doing some work');
    setTimeout(workb, Math.random() * 2000);
}

workb();